Stay-bolt for boilers.



I WITNESSES N. B. JARRIEL. STAY BOLT FOR BOILERS.

'APPLIOATION FILED SEPT. 25, 1905.

BY HIS fiTTORNEYS PATENTED APR. 10, 1906.

; UNITED STATES PATENT OFFICE.

STAY-BOLT FOR BOILERS.

Specification of Letters Patent.

Patented April 10, 1906.

Application filed September 25, 1905. Serial No. 280,013.

To all whom it may concern.-

Be it known that I, NATHAN JARRIEL, a citizen of the United States,residing at Ma nassas, in the county of Tattnall and State of- Georgia,have invented certain new and useful Improvements in Stay-Bolts forBoilers, of which the following is a specification.

The object of my invention is to provide an improved substitute for thestay-bolts now commonly employed to connect and hold in proper relationthe sheets or plates of steamboilers and other like structures.

In the use of the old style of stay-bolts much difficulty wasencountered in providing an arrangement which would be sufiicientlystrong, would be simple, and would not leak, and attempts have been madeto overcome these objections and difiiculties; but so far as I am awareno device has heretofore been produced which, while simple inconstruction, can be easily applied and will not leak.

According to my invention I construct a stay-bolt in two parts, one ofwhich comprises a threaded tapered head and a threaded shank and theother of which consists of a threaded tapered nut or plug having athreaded bore or socket to receive the shank. Both members of thestay-bolt have angular bosses to receive a wrench or other suitabletool, and the threaded parts of the two members are adapted to entertapered holes in the boiler-sheets.

In the accompanying drawings, Figure 1 is a view, partly in verticalsection and partly in side elevation, of a part of a steam-boiler withmy improvements applied. Fig. 2 is a view, on an enlarged scale, partlyin section and partly in elevation, more clearly indicating theconstruction of my improved staybolt and the manner of applying it. Fig.3 is a perspective view of one member of the stay-bolt, and Fig. 4 is aperspective view of the other member.

In Fig. 1 I have shown a conventional type of steam-boiler with myimproved staybolts applied around the fire-box. It will be understood,however, that they may be applied to other parts of the boiler. Thesestay-bolts comprise two members A and B. The member A consists of athreaded tapered head a and a shank a threaded at its outer portion of.The head carries an angular boss a adapted to receive a wrench or othersuitable .tool. The member B consists of a tapered hollow plug or nutthreaded on its exterior and also threaded in its bore 7) to receive thethreaded part a of the shank a It also has an angular boss 12, similarto the boss 0, and for the same purpose.

In applying the stay-bolts to a boiler tapered holes 0 are formed in thesheets or plates C, and these holes are threaded to receive the threadedhead a and the threaded plug B. The plug is inserted and screwed home inone of the sheets, and then the shank a is passed through a hole 0 inthe op osite sheet and made to enter the socket b 1n the plug B. Thenthe member A is turned by a wrench or other tool until the shank isscrewed home in the socket and the head a has passed through the hole 0.In other words, the plug B is attached to a sheet C in the mannerindicated in Fig. 2, so that its outer end extends a short distancebeyond .the inner face of the sheet, and then the member A is made toengage the opposite 7 sheet and the plug B in the manner 1nd1- cated.This operation is extremely simple and not only results in firmlyconnecting the members, but also efliciently stays the boilersheets andprevents leaks. It is evident that there can be no leak around thethreaded portion a of the shank, because the outer end of the bore orsocket b is closed. If there is a tendency to leak around the taperedhead and plug, such leakage may be stopped by giving slight turns to theplug and head.

These stay-bolts can be used in lace of the old style in constructin newboi ers or they may be employed to replace them in old boilers, it beingonly necessary in the case of old boilers to form the tapered holes a toreceive the head a and plug B. These bolts may also be used to ap lypatches on boilers and for repairs general y and may be made in anydesired sizes.

It will be observed that no hammering is required in applying thesebolts. It is not necessary to form heads on the ends of the bolts, asthe connections made with the sheets and between the two members of thebolt are strong and durable. At the same time any expansion orcontraction may be quickly compensated for by an adjustment of themembers without danger of leakage.

I claim as my invention- 1. A stay-bolt, comprisin a member having athreaded tapered head and a threaded shank formed integrally therewith,and a member which is tapered and threaded on its exterior and has athreaded bore or socket closed at its outer end to receive the said Ithreaded on its exterior and havirig a thread- 10 shank. ed socket toreceive the threaded. shank.

2. The combination with boiler sheets or In testimony whereof Ihavehereunto subplates having tapered threaded holes of a scribed my name. 5stay-bolt, comprising two members, one of which consists of a tapered,threaded head, NATHAN JARRIEL' provided with an angular boss and formedWitnesses:

integrally with a threaded shank, and the W. R. PI-IILLIPs, other ofwhich consists of a tapered plug l ST. Ms. B. ALEXANDER.

